MULTI-BRAND AC GATEWAY
Central air conditioning multi in one intelligent control gateway
One gateway can handle central air conditioning for 17 brands. No matter if your home decoration is from Daikin, Hitachi or Gree, just dial the code and the Modbus protocol will be directly connected. No need to change the air conditioner, no need to change the wiring, install and use on the same day.
Gateway wiring diagram
central air conditioning
Daikin Hitachi Toshiba Mitsubishi
Midea Gree Haier Hisense
Matsushita Boshi Sanxing York
Carrier, Trane, Heavy Industries, Haier
17 brands are fully compatible
Midea Gree Haier Hisense
Matsushita Boshi Sanxing York
Carrier, Trane, Heavy Industries, Haier
17 brands are fully compatible
2-core shielded wire
→
F1-F2 / 1-2 / X-Y
Multi in one gateway
TDFH-DUX/YC
80 × 87 × 39 mm
DC 12-24V / 2-3W
Dial code to switch brands
80 × 87 × 39 mm
DC 12-24V / 2-3W
Dial code to switch brands
RS485 / NET
→
Modbus RTU/TCP
Central Control System
PLC · SCADA · Upper computer
HomeAssistant · KNX
Crestron Building Automation
Standard Modbus protocol
HomeAssistant · KNX
Crestron Building Automation
Standard Modbus protocol
🔥 Daikin
Hitachi
Toshiba
Mitsubishi Electric
Mitsubishi Heavy Industries
🔥 Midea
🔥 Gree
Hisense
Heavy Industry Haier
Panasonic
Haier
Bosch
Samsung
Carrier
Trang
York
📡 Communication parameters
Baud rate: 9600bps Data bit: 8 Stop bit: 1 Checkpoint: NONE Mode: RTU
📦 function code
0x04 Read input register (status query) 0x06 Preset single register (switch/mode/temperature) 0x10 preset multiple registers (batch control)
🔌 Maximum internal units: 64 units (Mitsubishi Electric 50 units)
WHY THIS GATEWAY
You have installed central air conditioning in your home, but your smart home cannot connect to it?
Do you want to connect the central air conditioning systems provided by Daikin, Hitachi, and Gree to smart homes? The original factory protocol is closed, the interface is not open, and the solution price is over ten thousand yuan - this gateway is specifically designed to solve this problem. Dial the code and the Modbus protocol will be directly connected. It can be installed and used on the same day.
🏠 Standard air conditioning for furnished rooms, not compatible with smart homes
The developer provided Daikin/Hitachi/Gree, but the panel can only be manually pressed. Do you want to use your phone for temperature control? Do you want to connect to HomeAssistant, KNX, Crestron? The original factory did not provide the agreement, and the integrator quoted tens of thousands - this gateway ¥1,298 Got it.
🔧 The integrator needs to adapt to different brands every time they dock
Daikin has F1-F2 ports, Hitachi has 1-2 ports, Gree has D1-D2... Each brand has a different protocol, and every on-site debugging requires checking the documentation on the computer. This gateway 17 brands unify Modbus protocolDial code switching, one set of codes works.
📊 Commercial buildings need to centrally control dozens of internal machines
Office buildings, hotels, shopping malls, dozens of air conditioners scattered on different floors. The traditional solution is to add a panel to each unit, which incurs high management costs. One gateway Control up to 64 internal units， Modbus unified collection, PLC/SCADA/upper computer direct polling.
💰 The original factory solution is too expensive, and the alternative solution is unreliable
The original factory centralized controller iTouch from Daikin is priced at over 8000, but it is not yet an open Modbus protocol. The cheap IR infrared solutions on the market lose codes and do not provide feedback on the true status. This gateway Directly connected to the air conditioning signal lineRead and write real registers without relying on infrared guessing status.
CORE CAPABILITIES
A gateway that can read all the statuses of your air conditioner
Without relying on infrared coding or cloud transfer - directly connected to the air conditioning signal line, Modbus register real-time reading and writing, turning the central air conditioning into a standard industrial equipment.
01
real-time monitoring
Operation/stop, cooling/heating/air supply/dehumidification modes, set temperature, indoor temperature, wind speed gear (LL-HH), fault codes - all read through Modbus registers
Operation/stop, cooling/heating/air supply/dehumidification modes, set temperature, indoor temperature, wind speed gear (LL-HH), fault codes - all read through Modbus registers
02
Remote control
Power on/off, mode switching, temperature setting, wind speed adjustment - write corresponding registers through 0x06 function code, millisecond response
Power on/off, mode switching, temperature setting, wind speed adjustment - write corresponding registers through 0x06 function code, millisecond response
03
system retrieval
Automatically discover the number of connected internal devices and network addresses without manual configuration, recognized upon power on
Automatically discover the number of connected internal devices and network addresses without manual configuration, recognized upon power on
04
Fault Diagnosis
Read the abnormal code register and quickly locate the fault type by comparing it with the brand mapping table, without having to go to the site to check the panel
Read the abnormal code register and quickly locate the fault type by comparing it with the brand mapping table, without having to go to the site to check the panel
COMPATIBLE BRANDS
17 mainstream brands, switch by dialing the code
No need to burn firmware, no need to download from the cloud - the 10 digit dip switch on the back of the gateway, dial it according to the brand chart, and it will adapt when powered on. The factory status is all 0.
🔥 Daikin Daikin
Dial code: 0000000000 | Port F1-F2 → AC1-AC2 | Both internal and external devices can be installed, with multiple external devices connected in series
Hitachi HITACHI
Dial code: 1000000011 | Port 1-2 → AC1-AC2 | Exception codes are detailed in the mapping table
Toshiba Toshiba
Dial code: 0100000000 | Port U1-U2 → AC1-AC2 | Supports both single and multiple systems
Mitsubishi Electric
Dial code: 1100000000 | Port M1-M2 → AC1-AC2 | Maximum of 50 internal units
Mitsubishi Heavy Industries
Dial code: 0010000000 | Port A-B → A-B
🔥 Midea MIDEA
Dial code: 1010000000 | Port X-Y (or P-Q) → A-B | It is recommended to install it on the outdoor unit
🔥 Gree GREE
Dial code: 0110001000 | Ports D1-D2/G1-G2 → H-L | Different dialing codes for single/multiple systems, it is recommended to install outdoor units
Hisense Hisense
Dial code: 111000011 | Port 1-2 → AC1-AC2
Heavy Industry Haier
Dial code: 0010000000 | Port A-B → A-B
Panasonic PANASONIC
Dial code: 1001000000 | Port U1-U2 → AC1-AC2 | It is recommended to install it on the outdoor unit
Haier HAIER
Dial code: 0101000000 | Port P-Q → AC1-AC2
Bosch BOSCH
Dial code: 1101000000 | Port X-Y → A-B
Samsung
Dial code: 0111000000 | Port F1-F2 → A-B
Carrier CARRIER
Dial code: 0011000000 | Port X-Y → A-B
Trane Trane
Dial code: 1011000000 | Port X-Y → A-B
York York
Dial code: 1111000011 | Port 1-2 → AC1-AC2
QUICK START
5-step installation, completed on the same day
01 · Dial code
10 digit dip switch on the back of the gateway, dial to the corresponding position according to the brand chart (all 0 at the factory)
02 · Wiring
Connect the air conditioning signal port to the corresponding port of the gateway using a 2-core shielded wire (RVVP 2 × 0.75mm ² or more). Cannot be replaced by Ethernet cable
03 · Power on
Connect the DC 12-24V power supply to the gateway P1/P2 or DC12V port, and dial the address code for the air conditioning thermostat
04 · Docking
RS485 or network port connection to the central control host/PLC/upper computer. Baud rate 9600, 8N1, Modbus RTU protocol
05 · Power off and restart
Installation completed, power off and restart all air conditioning and gateway, check if STA indicator light stays on and VRV indicator light flashes - completed
TECH SPECS
Technical Specifications
Product model TDFH-DUX/YC, industrial grade design, can be installed both indoors and outdoors
📐 Physical specifications
Size 80 × 87 × 39mm, DC 12-24V power supply, power consumption 2-3W, can be installed indoors and outdoors (Gree/Midea/Panasonic suggest outdoor unit)
🔌 Communication Interface
RS485 terminal+RJ45 network port, supporting Modbus RTU and Modbus TCP dual channels. Half duplex transmission, 1 start bit+8 data bits+1 stop bit, no checksum
📡 Modbus protocol
Function codes 0x04 (read input register), 0x06 (preset single register), and 0x10 (preset multiple registers). Support broadcasting, with a maximum of 4 internal machine statuses read in one query
🏢 capacity limit
Mitsubishi Electric has a maximum of 50 internal units, while other brands have a maximum of 64 units. Each external machine in a multi machine system is equipped with a separate gateway
🔧 Installation requirements
Air conditioning signal lines should use 2-core shielded wires (RVVP 2 × 0.75 or above), and it is strictly prohibited to replace them with network cables. The distance between the signal line and the power line is ≥ 15cm, and the distance between the signal line and other signal lines is ≥ 30cm
🔄 Firmware update
Use dedicated upgrade software to upgrade via RS485/NET, with the manufacturer providing upgrade software, fault diagnosis software, and firmware packages
📦 Packing List
Gateway x 1, Certificate of Conformity x 1, Product Specification x 1
⚠️ Precautions
It is strictly prohibited to disassemble and repair without authorization. Connecting the power cord to the signal end incorrectly may burn out the fuse. Please contact the manufacturer for assistance. All circuits must be equipped with residual current circuit breakers
USE CASES
From one bedroom to the entire building, one solution covers all aspects
🏠
Smart Home
Deluxe room central air conditioning → Gateway → HomeAssistant/Crestron/KNX. Mobile temperature control, voice control, automatic shutdown when leaving home, and pre cooling when returning home. A gateway manages the entire house, without the need to add panels to each room.
Deluxe room central air conditioning → Gateway → HomeAssistant/Crestron/KNX. Mobile temperature control, voice control, automatic shutdown when leaving home, and pre cooling when returning home. A gateway manages the entire house, without the need to add panels to each room.
🏢
Building Automation
Dozens of air conditioners are scattered on different floors → gateway → BACnet/Modbus TCP → building control system. Unified switch in the central control room, batch scheduling according to the schedule, and automatic fault alarm. After the system is put into operation, the average energy saving is 25% -40%.
Dozens of air conditioners are scattered on different floors → gateway → BACnet/Modbus TCP → building control system. Unified switch in the central control room, batch scheduling according to the schedule, and automatic fault alarm. After the system is put into operation, the average energy saving is 25% -40%.
🏨
Hotel/Business
Room air conditioning → Gateway → PMS hotel management system. Automatic air conditioning upon check-in, automatic check-out, and individual billing. Each internal unit of the multi split system independently measures and accurately distributes electricity costs.
Room air conditioning → Gateway → PMS hotel management system. Automatic air conditioning upon check-in, automatic check-out, and individual billing. Each internal unit of the multi split system independently measures and accurately distributes electricity costs.
🏭
Industrial centralized control
Factory office area/workshop air conditioning → gateway → PLC/SCADA. The Modbus protocol is native to mainstream PLCs such as Siemens, Mitsubishi, and Huichuan, and does not require additional protocol converters. Automatic interlocking triggered by abnormal temperature in the production environment.
Factory office area/workshop air conditioning → gateway → PLC/SCADA. The Modbus protocol is native to mainstream PLCs such as Siemens, Mitsubishi, and Huichuan, and does not require additional protocol converters. Automatic interlocking triggered by abnormal temperature in the production environment.
WHY US
What are the differences compared to other solutions on the market
✅ True Modbus, not infrared pairing
There are dozens of infrared remote controllers on the market that can also control the air conditioner, but that is a one-way command - you don't know if the air conditioner is turned on or how much it is set. This gateway is directly connected to the air conditioning signal line and reads the true value of the internal register of the air conditioning. A 0x04 frame message pulls back all states.
✅ 17 brands, no need to buy more than ten gateways
Different projects may encounter different brands of air conditioners. Buy a dedicated gateway for each brand? Inventory and debugging costs have both exploded. This gateway can switch brands by dialing the code on the back. One model is compatible, and the integrator only needs to stock one.
✅ No need for cloud computing
Some gateways require networking, account registration, and cloud platform payment. This gateway is a pure Modbus slave - connected to a 485 line, the upper computer directly sends messages. Network disconnection does not affect air conditioning control, and data cannot be exported locally.
✅ There are documents, protocols, and register tables
The product manual comes with a complete Modbus register mapping table - which address to use for reading status, which address to use for writing control, and what meaning each bit represents, written clearly. You don't have to reverse engineer the protocol yourself, you don't have to guess the registers. Engineers can write code as soon as they have it in hand.
FAQ
Frequently Asked Questions
My home is equipped with Midea/Gree central air conditioning. Can I use it?
Can. Both Midea and Gree support it. However, please note that these two brands recommend installing the gateway on the outdoor unit side. Midea has two types of wiring ports (X-Y or P-Q), please confirm your specific model before installation.
Does this gateway need to be connected to the internet?
No need. The gateway communicates with your central control host through RS485 or Ethernet port. Even if the external network is disconnected, Modbus communication within the local area network is not affected. There is no monthly cloud platform fee and no account system.
How many internal devices can a gateway manage?
Look at the brand. Mitsubishi Electric has a maximum of 50 units, while other brands (Daikin, Hitachi, Gree, Midea, etc.) have a maximum of 64 units. If it is a multi peripheral system, each peripheral is equipped with a separate gateway.
Can I connect to HomeAssistant?
Can. Gateway output standard Modbus RTU/TCP protocol, HomeAssistant has native Modbus integration. Connect the RS485 cable to the USB to 485 module, configure the sensor and switch in HA, and complete it in a few minutes.
Do installation require professional personnel?
It is recommended to have HVAC or weak current engineers handle the operation. The air conditioning signal line needs to be connected (cannot be connected incorrectly, otherwise the fuse will be blown), and a code needs to be dialed. It is not recommended for ordinary users to do it themselves.
One gateway to connect the air conditioning system throughout the entire house
¥ 1298, installed and used on the same day. The product manual includes a complete Modbus register mapping table, which engineers can write code upon receiving.
